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Renesas ISL9120IRTAZ
- Part No.:
- ISL9120IRTAZ
- Manufacturer:
- Renesas
- Package:
- 12-WFQFN Exposed Pad
- Datasheet:
-
ISL9120IRTAZ.pdf
- Description:
- IC REG BUCK BST ADJ 800MA 12TQFN
- Quantity:
- Payment:
- Shipping:
Inventory:599
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Product details
Overview
ISL9120IRTAZ from Intersil is a compact, high-efficiency buck-boost switching regulator supporting input voltages from 1.8V to 5.5V and delivering up to 800mA output current at 3.3V. It features automatic buck/boost mode transition, selectable forced bypass mode (≤3.5µA quiescent current), and adaptive PFM control for peak efficiency up to 98%. It serves as the primary power stage in battery-powered portable electronics requiring wide VIN-to-VOUT flexibility.
For engineers reviewing the ISL9120IRTAZ datasheet, ISL9120IRTAZ pinout, ISL9120IRTAZ application, or ISL9120IRTAZ equivalent, key selection criteria include its adjustable-output capability (via FB pin), 12-lead 3×3mm TQFN package, thermal shutdown at 150°C, UVLO threshold of 1.725V (rising), and soft-discharge resistance of 110Ω - all critical for low-power wearable and mobile power architecture design.
Technical Context
The ISL9120IRTAZ implements a four-switch buck-boost topology with integrated P-channel and N-channel MOSFETs (rDSON = 63mΩ each), enabling seamless transitions between buck, boost, and automatic bypass modes without output disturbance. Its adaptive multilevel current limit scheme dynamically adjusts peak inductor current across 32 levels (350mA–2A) based on pulse count, optimizing efficiency from light to full load.
It uses separate analog (GND) and power (PGND) ground pins to isolate sensitive reference circuitry from high di/dt switching currents, and integrates soft-start (1ms typical delay), soft-discharge (110Ω internal VOUT-to-GND resistor), and precise voltage regulation via 0.8V FB reference. The BYPS pin enables forced bypass mode, while EN provides logic-controlled enable/disable with <1µA shutdown current.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Input Voltage Range | 1.8V to 5.5V - supports single-cell Li-ion (2.7–4.2V), Li-polymer, or dual-cell alkaline inputs without external pre-regulation. |
| Output Current Capability | Up to 800mA at VIN=2.5V/VOUT=3.3V - sufficient for powering PMICs, RF transceivers, or sensor hubs in portable devices. |
| Quiescent Current | 41µA in PFM mode, ≤3.5µA in forced bypass - extends battery life during standby or low-activity states. |
| Efficiency | Up to 98% - minimizes thermal dissipation in space-constrained 3×3mm TQFN packages. |
| Feedback Reference Voltage | 0.80V - enables precise programmable output (1.0V–5.2V) using standard resistor dividers with low bias current (0.025µA). |
| Thermal Shutdown Threshold | 150°C with 35°C hysteresis - protects against sustained overload or poor PCB thermal design without latch-up. |
| UVLO Rising Threshold | 1.725V - prevents erratic startup or regulation failure during battery brownout conditions. |
| Soft-Start Time | 1ms typical delay from EN assertion to ramp start - controls inrush current and avoids input supply sag. |
Pinout & Package
ISL9120IRTAZ is housed in a RoHS-compliant 12-lead 3mm×3mm thin quad flat no-lead (TQFN) package (PKG DWG L12.3x3A) with exposed thermal pad (EPAD) for enhanced heat dissipation. Pin numbering follows top-view orientation with pin 1 located at the index corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| LX1 (Pins 3,4) | Inductor input-side connection | Connects to one end of the external 1µH inductor; carries high-frequency switching current during both buck and boost phases. |
| LX2 (Pins 1,12) | Inductor output-side connection | Connects to the other end of the inductor; interfaces directly with internal H-bridge switches and determines current path direction. |
| VIN (Pins 5,6) | Main power input | Accepts 1.8–5.5V supply; requires 10µF ceramic capacitor to PGND for high-frequency decoupling and stability. |
| VOUT (Pin 11) | Regulated output node | Delivers regulated output; must be connected to 22µF or 47µF X5R ceramic capacitor to PGND for ripple suppression and transient response. |
| FB (Pin 10) | Feedback input | Senses output voltage via external resistor divider; 0.8V reference enables adjustable outputs from 1.0V to 5.2V. |
| BYPS (Pin 7) | Bypass mode control | Logic HIGH enables direct VIN-to-VOUT conduction (no regulation); used to minimize quiescent current when downstream regulation is handled externally. |
| EN (Pin 9) | Enable input | Active-HIGH logic control; drives LOW to disable device and activate 110Ω soft-discharge path from VOUT to GND. |
| GND (Pin 8) | Analog ground | Reference for internal bandgap, comparators, and feedback circuitry; must be isolated from high-current PGND paths. |
| PGND (Pin 2) | Power ground | Return path for LX1/LX2 switching currents and input/output capacitors; connects to EPAD for thermal and EMI performance. |
Key Features
| Feature | Design Value |
|---|---|
| Four-switch buck-boost topology | Enables continuous regulation across VIN < VOUT, VIN ≈ VOUT, and VIN > VOUT - eliminates need for separate buck and boost converters in variable-input systems. |
| Adaptive multilevel current limit | 32 programmable peak current thresholds (350mA–2A) adjusted in real time by PFM pulse count - maintains high efficiency from 10µA to 800mA load range. |
| Automatic bypass mode | Engages when |VIN − VOUT| ≤ 1–2%, reducing output ripple and improving efficiency beyond switching operation - ideal for near-rail applications. |
| Forced bypass mode | Reduces total supply current to ≤3.5µA by shorting VIN to VOUT through internal FETs - saves power when downstream LDO or PMIC handles final regulation. |
| Dual ground architecture | Separate GND (analog reference) and PGND (high-current return) pins - prevents ground bounce from degrading voltage accuracy or causing instability. |
| Integrated soft-discharge | 110Ω internal resistor activated on EN deassertion - safely discharges VOUT without external components, preventing floating rail issues during power sequencing. |
Applications
| Smartphone Power Management | Wearable Health Monitor |
|---|---|
|
Use Scenario: Powers baseband processor and display driver ICs from a single-cell Li-ion battery whose voltage sags from 4.2V to 2.8V during discharge. IC Role / Device Role / Timing Role: Primary buck-boost regulator providing stable 3.3V rail regardless of battery state; manages dynamic load steps up to 500mA with <1.5% output deviation. Use Value: Eliminates need for separate LDOs or dual-regulator schemes, reducing BOM count and PCB area while maintaining PSRR and transient response across full battery range. |
Use Scenario: Supplies ultra-low-power MCU and optical heart-rate sensor in a wrist-worn fitness tracker operating 7 days per charge. IC Role / Device Role / Timing Role: Adjustable-output regulator (set to 1.8V) with forced bypass mode active during sleep cycles to cut system quiescent current below 5µA. Use Value: Extends battery life by minimizing idle power loss - 3.5µA bypass current vs. 41µA PFM operation reduces average consumption by >85% during 90% duty-cycle sleep periods. |
| Tablet USB-C PD Sink | Industrial Handheld Scanner |
|
Use Scenario: Accepts variable 3.0–5.5V input from USB-C Power Delivery negotiation and delivers fixed 3.3V to Wi-Fi/BT combo module. IC Role / Device Role / Timing Role: Input-flexible DC/DC stage that maintains regulation during PD contract renegotiation or cable insertion events. Use Value: Prevents communication dropouts during voltage transitions; automatic buck/boost mode switching ensures uninterrupted 3.3V supply even during 100ms input dips. |
Use Scenario: Powers barcode imager ASIC and flash LED in a ruggedized handheld scanner powered by replaceable AA batteries (1.2–3.0V). IC Role / Device Role / Timing Role: Wide-input buck-boost regulator delivering 5.0V to LED driver and 3.3V to imager, supporting operation down to 1.8V input. Use Value: Enables full functionality across entire battery discharge curve - extends usable runtime by 35% compared to fixed-input buck-only solutions that cut out below 2.5V. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar buck-boost regulator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TPS63020DSJR | Fixed 3.3V output only; no adjustable version; higher quiescent current (25µA PFM) and lower max output current (800mA at 3.3V but derated above 4V input). | Best suited for cost-sensitive designs where output voltage is fixed and input stays within 2.5–5.5V; lacks forced bypass mode. | Select ISL9120IRTAZ when adjustable output, forced bypass, or tighter line/load regulation (<0.0072 mV/mA) is required. |
| MAX77827AEWE+T | Higher integration (dual output, I²C programmable); larger 16-pin 3.2×3.2mm WLP package; higher cost; requires external compensation. | Targeted at multi-rail PMIC subsystems needing coordinated sequencing and telemetry; not optimized for minimal footprint or lowest IQ. | Choose ISL9120IRTAZ for single-rail, space-constrained, ultra-low-IQ applications where simplicity and small 3×3mm TQFN are prioritized over digital control. |
Compared with TPS63020DSJR and MAX77827AEWE+T, the ISL9120IRTAZ offers superior light-load efficiency (41µA vs. 25µA/30µA), true adjustable output (1.0–5.2V), and dedicated forced bypass mode - making it optimal for battery-critical portable devices where board area, IQ, and output flexibility are decisive.
Availability
ISL9120IRTAZ is available at Aetrix Electronics and suitable for smartphone power management, wearable health monitors, and industrial handheld scanners requiring stable component supply with consistent parametric performance and long-term lifecycle support.
Supply support for ISL9120IRTAZ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
Intersil Corporation is a leading provider of precision analog and power management ICs, now part of Renesas Electronics, with deep expertise in high-efficiency DC/DC conversion and battery-aware power architectures.
The ISL9120IRTAZ belongs to Intersil's compact buck-boost regulator family designed specifically for space- and power-constrained portable electronics, emphasizing seamless mode transition, ultra-low quiescent current, and minimal external component count.
FAQ
What output voltage options does the ISL9120IRTAZ support?
The ISL9120IRTAZ is an adjustable-output buck-boost regulator with a 0.8V internal reference. Using an external resistor divider on the FB pin, it supports output voltages from 1.0V to 5.2V. Unlike the fixed-output ISL9120IRTNZ (3.3V), the ISL9120IRTAZ requires R1 and R2 resistors - for example, 187kΩ and 60.4kΩ yield 3.3V. This configurability makes ISL9120IRTAZ ideal for systems needing non-standard rails like 1.8V or 5.0V.
How does the ISL9120IRTAZ handle input voltage transitions near the output voltage?
The ISL9120IRTAZ engages automatic bypass mode when |VIN − VOUT| falls within ~1–2%, creating a low-loss direct path from VIN to VOUT via internal FETs. This avoids switching losses and reduces output ripple significantly. During this mode, regulation is maintained passively by the upstream source, and the ISL9120IRTAZ consumes minimal current - enhancing efficiency in near-rail conditions common in Li-ion battery applications.
Can the ISL9120IRTAZ operate safely in forced bypass mode under heavy load?
No - forced bypass mode disables overcurrent protection. The ISL9120IRTAZ specifies no current limit in this mode, so excessive load or short-circuit can cause thermal damage. It is intended only for low/no-load scenarios, such as powering an LDO in standby. For reliable operation, forced bypass should be used only when downstream regulation ensures current remains within safe limits - never as a primary power path for high-current loads.
What is the recommended inductor for the ISL9120IRTAZ and why?
A 1µH shielded ferrite inductor rated for ≥2A saturation current is recommended for the ISL9120IRTAZ. Examples include Toko DFE201610R-H-1R0M (2.0×1.6×1.0mm, 2.7A Isat) or TDK TFM201610GHM-1R0MTAA (3.8A Isat). Low DCR (<70mΩ) minimizes conduction loss, while shielding contains magnetic flux to reduce EMI - critical in dense portable layouts where radiated noise affects RF performance.
Does the ISL9120IRTAZ require special PCB layout considerations?
Yes - proper layout is essential. Place the 10µF input capacitor and 22–47µF output capacitor as close as possible to their respective pins (VIN/VOUT), with short, wide traces to PGND. Use separate GND and PGND copper pours connected only at a single point near the IC. Route LX1/LX2 traces away from sensitive analog nodes, and ensure the EPAD is soldered to a large thermal pad with ≥4 vias to inner-layer ground planes for thermal and EMI control.
ISL9120IRTAZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 12-WFQFN Exposed Pad
- Packaging:
- Tray
- Product Status:
- Active
- Function:
- Step-Up/Step-Down
- Output Configuration:
- Positive
- Topology:
- Buck-Boost
- Output Type:
- Adjustable
- Number of Outputs:
- 1
- Voltage - Input (Min):
- 1.8V
- Voltage - Input (Max):
- 5.5V
- Voltage - Output (Min/Fixed):
- 1V
- Voltage - Output (Max):
- 5.2V
- Current - Output:
- 800mA
- Frequency - Switching:
- -
- Synchronous Rectifier:
- No
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 12-TQFN (3x3)
ISL9120IRTAZ FAQ
1.How can I place an order for ISL9120IRTAZ through Aetrix?
Please submit a Request for Quotation (RFQ) for ISL9120IRTAZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for ISL9120IRTAZ reliable?
The price and inventory of ISL9120IRTAZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ISL9120IRTAZ is usually 5 days.
3.What payment methods are accepted for ISL9120IRTAZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ISL9120IRTAZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ISL9120IRTAZ?
ISL9120IRTAZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ISL9120IRTAZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for ISL9120IRTAZ?
For technical support, including ISL9120IRTAZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ISL9120IRTAZ requirements.
6.How does Aetrix verify that ISL9120IRTAZ is sourced from the original manufacturer or authorized distributors?
All ISL9120IRTAZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that ISL9120IRTAZ meets industry standards.
7.What is the process for return or replacement of ISL9120IRTAZ?
All ISL9120IRTAZ units undergo pre-shipment inspection (PSI). If there is an issue with ISL9120IRTAZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The ISL9120IRTAZ part is unused and in its original packaging.
Return procedure for ISL9120IRTAZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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